/*
 * Copyright ConsenSys AG.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
package org.hyperledger.besu.ethereum.mainnet;

import org.hyperledger.besu.ethereum.core.Account;
import org.hyperledger.besu.ethereum.core.Address;
import org.hyperledger.besu.ethereum.core.Gas;
import org.hyperledger.besu.ethereum.core.Wei;
import org.hyperledger.besu.ethereum.vm.MessageFrame;

import org.apache.tuweni.units.bigints.UInt256;

public class SpuriousDragonGasCalculator extends TangerineWhistleGasCalculator {

  private static final Gas EXP_OPERATION_BYTE_GAS_COST = Gas.of(50L);

  @Override
  public Gas callOperationGasCost(
      final MessageFrame frame,
      final Gas stipend,
      final UInt256 inputDataOffset,
      final UInt256 inputDataLength,
      final UInt256 outputDataOffset,
      final UInt256 outputDataLength,
      final Wei transferValue,
      final Account recipient,
      final Address to) {
    final Gas inputDataMemoryExpansionCost =
        memoryExpansionGasCost(frame, inputDataOffset, inputDataLength);
    final Gas outputDataMemoryExpansionCost =
        memoryExpansionGasCost(frame, outputDataOffset, outputDataLength);
    final Gas memoryExpansionCost = inputDataMemoryExpansionCost.max(outputDataMemoryExpansionCost);

    Gas cost = callOperationBaseGasCost().plus(memoryExpansionCost);

    if (!transferValue.isZero()) {
      cost = cost.plus(callValueTransferGasCost());
    }

    if ((recipient == null || recipient.isEmpty()) && !transferValue.isZero()) {
      cost = cost.plus(newAccountGasCost());
    }

    return cost;
  }

  @Override
  protected Gas expOperationByteGasCost() {
    return EXP_OPERATION_BYTE_GAS_COST;
  }

  private static final Gas SELFDESTRUCT_OPERATION_GAS_COST = Gas.of(5_000L);

  private static final Gas SELFDESTRUCT_OPERATION_CREATES_NEW_ACCOUNT = Gas.of(30_000L);

  @Override
  public Gas selfDestructOperationGasCost(final Account recipient, final Wei inheritance) {
    if ((recipient == null || recipient.isEmpty()) && !inheritance.isZero()) {
      return SELFDESTRUCT_OPERATION_CREATES_NEW_ACCOUNT;
    } else {
      return SELFDESTRUCT_OPERATION_GAS_COST;
    }
  }
}
